INSTRUCTION MANUAL
Electronic Buchholz Relay eBR
5COR472400 – eBR – REV01
I
II
CONTENT:
1
SAFETY
1.1
1.2
1.3
Safety instructions
Specified applications
Safety notes on the equipment operation
2
ELECTRONIC BUCHHOLZ RELAY TYPE “eBR”
2.1
Drawing
2.1.1
eBR 80
2
2.2
Operating principle
3
2.2.1
2.2.2
Adding features
Construction
3
3
2.3
Technical features
4
2.4
Test
5
3
INSTALLATION
6
4
ELECTRICAL CONNECTION
7
5
FUNCTIONAL TEST
9
1
1
1
2
5.1
Mechanical testing by test keys
9
5.1.1
5.1.2
Volume alarm verification
Trip verification
9
9
5.2
Pneumatic testing by pneumatic valve
10
6
WHAT TO DO IN THE CASE OF GAS ACCUMULATION
10
7
OPERATION AND MAINTENANCE
11
7.1
7.2
7.3
Operation
Maintenance
Movement, transport and storage
11
11
11
A
APPENDIX A – MODBUS (RTU) REGISTERS
A.1
A.2
Addressing
Registers Tables
12
13
A.2.1
A.2.2
Main registers Table
Memory registers
13
13
A.3
Register Description
14
A.3.1
Main registers Descriptions
14
B
APPENDIX B – PETCOCK
B.1
Connection
15
B.2
Contact Technical Data
15
C
APPENDIX C – GAS SAMPLING DEVICE
C.1
Drawing
16
C.2
Construction
16
D
APPENDIX D – Order sheet
17
E
APPENDIX E – Figure and reference numbers key
18
0
1. SAFETY
1.1 Safety instructions
Make sure that any personnel installing and operating the “electronic Buchholz relay””:
Are technically qualified and competent
Fully comply with these assembling instructions
Improper operations or misuse could cause danger to:
Life and limb
To the equipm ent and other assets of the operator
To the proper function of the equipment
Safety instructions in this manual are shown in three different forms to emphasize important information.
WARNING
This information indicates particular danger to life and health. Disregarding such a warning can lead to
serious or fatal injury.
CAUTION
This information indicates particular danger to equipment and/or other property of the user. Serious or fatal
injury cannot be excluded.
NOTE
This note gives important and specific information concerning the equipment.
1.2 Specified applications
The Buchholz Relay is used to protect the transformer when a malfunction occurs (high eddy current, local overheating or partial
discharges) inside the main tank
It is important to observe the limit values indicated on the nameplate and in the operating instruction before commissioning the device.
1.3 Safety notes on the equipment operation
Electrical installation is subject to the relevant national safety rules.
It is mandatory to connect the grounding cable.
CAUTION
Installation, electrical connection and fitting the device may only be performed by qualified personnel and
only in accordance with this instruction manual.
It is the responsibility of the user to ensure that the device is used for specified application only.
For safety reasons, please avoid any unauthorized and improper usage.
WARNING
All relevant fire protection regulations must be strictly followed.
1
2. ELECTRONIC BUCHHOLZ RELAY TYPE “eBR”
2.1 Drawing
2.1.1 eBR 80
General dimensions for the electronic Buchholz Relay type eBR80
9
10
10
1
2
Fig. A
8
3
4
Fig. C
7
6
Fig. B
5
2
2.2 General information and operating principle
The generation of gas in an oil filled transformer is a clear indication of a problem. The gas may be a result of the following:
Decomposition/degradation either of solid or liquid insulation inside the transformer due to overheating, or arcing.
From external environment through bad pipeline sealing
From the oil itself due to unsatisfactory de-gassing operations prior filling transformer main tank
Fast and sudden oil movem ent in the pipeline towards the oil conservator is caused by an internal arc, short circuit, or hot spot which
must be correctly addressed.
Oil leaks from the transformer are environmentally unacceptable and a fire hazard will lead to transformer failure.
The Buchholz relay is located in the pipework between the transformer and its conservator and it is filled with oil during normal
transformer operation. When gas is generated in the transformer it rises towards the conservator and collects in the upper chamber of
the relay.
The oil level drops and the top float triggers alarm switch (oil level between 200 to 300 ml).
Gas shall not freely pass from the relay body and escape into the pipework before the alarm contact has operated.
The trip contact shall operate at a steady oil flow. This operation shall not be adversely affected when the alarm contact has already
closed and gas is escaping freely.
In the event of an oil leak the Buchholz relay will only operate after the conservator has exhausted all of its oil.
2.2.1 Adding features
COMEM's proven expertise led to develop a new eBR Electronic Buchholz Relay that noticeably improves the performances, reliability
and safety of your transformer thanks to advanced monitoring features.
The reed based standard electro-mechanical features, an electronic transducer and a dedicated PCB allow you to constantly monitor
the gas accumulation in the Buchholz relay by 4-20mA analog output or MODBUS RTU protocol.
The double flow vanes ensure the detection of two thresholds of oil flow speed. In particular, an alarm and a trip signal are
independently generated at two different values of oil flow (e.g. alarm at 1.5m/s and trip at 3m/s).
A based on the use of dedicated reed contacts for the detection of the oil flow thresholds provides the possibility to immediately and
remotely identify the trip causes (oil flow or oil leakage/gas accumulation) by means of 4-20mA analog output or MODBUS RTU
protocol.
As option there is the possibility to remotely control an electrical contact on the PCB in such a way to command the opening of valve for
the gas discharge.
2.2.2 Construction
eBR Electronic Buchholz Relay is built on a robust foundation which consists of a die casting aluminum main body with two tempered
glass inspection windows (1/A) with graduated scale markings (cubic centimeters) that indicates the oil volume passing through the
relay. The oil drain plug is located at the bottom of the main body (2/A).
The top cover holds the frame which contains the moving parts of the eBR: two floats (3/B) and their associated switch reeds and
magnets, two calibrated flow valves (4/B).
Also:
•
•
•
•
•
A gas discharge valve with G1/8” in male thread with protective cap (5/C)
A valve for pneumatically testing the alarm and insulation circuits, with protective cap (6/C)
A push rod for volume alarm mechanical verification of the reed switch with protective cap (7/C)
A push rod for trip mechanical verification of the reed switch with protective cap (8/C)
A terminal box (9/A)
3
2.3 Technical features
Material
All the external parts are resistant to transformer oils, salt fog and UV rays.
Color
White RAL 9002(1)
Ambient temperature
-40°C ÷ +80°C
Degree of protection
IP65 according to EN60529
Oil temperature
-40°C÷115°C
Weight
6,5 Kg
Ventilation valve
1, to prevent the formation of condensation
Cable gland
n°2 x M25x1.5
Terminal box
Screw terminal 2.5mm
2
2
Wires
2
2
Max 2.5mm – advised 4x1mm o 6x1mm shielded twisted pair cable for analog/digital
output
Oil flow speed (m/s)
Alarm
Trip
-
1.0
1.0
1.5
1.0/1.5
2.0
1.0/1.5/2.0
2.5
1.0/1.5/2.0/2.5
3.0
Electronic board features
Power supply (terminals 1-2)
24 Vdc ±10% polarized
Power consumption
0,5 W
Analog output (terminals 41-42)
4÷20 mA (dielectric strength between electronic card and analog output:1kV)
Minimum / Maximum resistance: 100 / 470
Distance for analog output
~ 200m
Digital output (terminals 3-4)
Serial RS485 (for more information contact COMEM assistance dept.)
Distance for digital output
~ 500m
Switch electrical data
(according to EN50126-1/2)
Breaking capacity
Dielectric strength of contacts
Between circuits and earth
Between contacts in open positions
(3)
Voltage
Current
Breaking capacity
24 d.c. to 220 V d.c.
2 A for 1000 maneuvers
250 W
L/R<40 ms
230 V a.c.
2 A for 1000 maneuvers
400 VA
cos >0.5
Short duration power frequency
withstand voltage 1 min – kV (r.m.s.)
2
(2)
1
Lightning impulse withstand voltage
kV (peak)
4
(2)
3
Table 1
(1)
For critical environmental conditions please contact COMEM
This test cannot be performed between the flow vanes contacts in open position in case they are connected to the electronic board
(3)
In case the flow vanes contacts are connected to the electronic board (see order sheet in the appendix D, line “Flow vane contacts
status verification via Modbus” selected YES), the available voltages are:
24-48 V a.c/d.c.
110-220 V a.c./d.c.
(2)
4
2.4 Tests
Description
Reference standard
Description
Reference standard
Fast transient/burs immunity test
IEC 61 000-4-4
Immunity test
IEC 61 000-6-2
Conducted disturbances
IEC 61 000-4-6
Emission standard
IEC 61 000-6-4
Electrostatic discharge
IEC 61 000-4-2
IP degree - IP 65
CEI EN 60259
Power-frequency magnetic field
IEC 61 000-4-8
Vibration Test
IEC 60068-3-3
Surge immunity test
IEC 61 000-4-5
Vibration Test
CEI EN 60721-3-4
(Class 4M4)
Harmonic current emission
IEC 61 000-3-2
Low temperature
IEC 60068-2-1
Voltage fluctuations and flicker
IEC 61 000-3-3
Dry heat
IEC 60068-2-2
Magnetic field immunity test
IEC 61 000-4-3
Damp heat, cyclic
IEC 60068-2-30
Supply variation
IEC 61 000-4-11
Damp heat, constant
IEC 60068-2-78
Table 2
5
3. Installation
CAUTION
The operating and installation requirements described in this manual must be strictly followed. If not, the
device can be damaged or a malfunction may occur.
eBR Electronic Buchholz Relay (1/D) is installed in the pipe (2/D) between the transformer tank (3/D) and the oil conservator (4/D).
Make sure that the pipe and the eBR Electronic Buchholz Relay have the same nominal diameters.
4
1
2
3
Fig. D
The red arrow on the cover at the top of the relay should always point towards the oil conservator.
The eBR must initially be full of oil which means that the minimum oil level of the conservator must be higher than the discharge valve
on the top of the relay (5/C).
The recommended angle of inclination of the eBR pipework should be between 0 to 5 degrees. The pipe from the transformer to the
eBR must exit the transformer at the highest point, it must be straight and the recommended length to the relay should be 10 times the
internal diameter of the pipe (L1). The distance between the eBR and the conservator should be at least 3 times the internal diameter of
the pipe (L2).
Make sure that:
eBR must initially be full of oil which means that the minimum oil level of the conservator must be higher than the discharge valve
on the top of the relay (5/C).
Gases produced in the insulating liquid can flow unimpeded to the eBR
The red arrow on the eBR points to the conservator.
The flanges are stressed evenly when tightening the screws.
The slope of the pipe to the conservator is between 0° and 5°.
The position of the eBR in relation to the direction of flow does not deviate from the perpendicular by more than 5°.
The pipe has no elbows, and bends are designed preferably with an inside pipe radius R > 100 mm.
The free pipe length between the eBR and the tank should be at least 10 times the internal diameter
The free pipe length between the eBR and the oil conservator should be at least 3 times the internal diameter (Should the distance
exceed the above values, a support has to be provided in the immediate vicinity of the eBR).
CAUTION
Make sure during installation that no dirt, moisture or foreign matters get into the relay.
The insulating liquid of the transformer/reactor may not contain conductive materials!
6
4. Electrical Connection
CAUTION
Electrical connections should only be performed by qualified and skilled personnel trained in the applicable
health and safety regulations of the relevant country.
WARNING
Dangerous electrical voltages!
It is imperative to deactivate the power supply during wiring of the device.
CAUTION
During the terminal box assembly, use caution not to damage the OR gasket. If this occurs it must be
substituted.
If you do not use all the 2 cable glands pay attention to close the free cable gland with a plug or gasket.
Multicore signal leads can be fitted in the Buchholz relay through cable glands (M25x1.5 – 3/E). A conductor cross section of 1.5 mm2
2
2
(copper) is recommended (4x1mm o 6x1mm shielded twisted pair cable for analog/digital output). The maximum cross section that can
be clamped is 2.5 mm2.
Proceed following the actions:
Unscrew the 5 un-losable M5 screws M5 (1/E)
Remove the cap (2/E)
Insert the lead through the cable gland (3/E)
Connect the lead to the terminal board (4/E) according to the chosen electrical scheme (tab.3-4)
(5)
Scheme
Alarm
level
(2)
F
NO
Alarm
Speed
Trip
Analog
output
MODBUS
RTU
Petcock
(1)
control
NO
NO
Available
Available
On demand
Available
Available
On demand
3
1
(3)
K
NO
NO
Q
NC
NO
NO
Available
Available
On demand
R
NC
NO
NC
Available
Available
On demand
S
NO
NO
C.O.
Available
Available
On demand
W
C.O.
NO
NO
Available
Available
On demand
X
NC
NO
C.O
Available
Available
On demand
U
C.O
NO
NC
Available
Available
On demand
Z
C.O
NO
C.O
Available
Available
On demand
NC
2
4
(4)
3
Fig. E
Table 3
Notes
(1)
See Annex B
NO: normal open contact
(3)
NC: normal closed contact
(4)
C.O.: change over contact
(5)
For other specific electrical scheme please contact COMEM
(2)
7
Scheme
F
K
Q
R
S
W
X
U
Z
24 VDC (+)
1
1
1
1
1
1
1
1
1
24 VDC (-)
2
2
2
2
2
2
2
2
2
RS485 (B)
3
3
3
3
3
3
3
3
3
RS485 (A)
4
4
4
4
4
4
4
4
4
4-20m A (+)
41
41
41
41
41
41
41
41
41
4-20m A (-)
42
42
42
42
42
42
42
42
42
24
24
24
24
24
24
21
21
GROUND
LEVEL
ALARM
FLOW
VANE
ALARM
21
21
21
21
22
22
22
22
22
22
22
22
22
31
31
31
31
31
31
31
31
31
32
32
32
32
32
32
32
32
32
14
14
14
14
14
14
TRIP
11
12
11
12
12
12
11
11
11
12
12
12
11
12
12
Table 4
Power supply (terminals 1-2): 24 Vdc ±10% polarized
Analog output (terminals 41-42): 4÷20 mA - Minimum / Maximum resistance: 100 / 470
Digital output (terminals 3-4): RS485
NOTE
The inner side of the electrical cap accommodates a label with the electrical schem e. The schemes show
the switching systems in their neutral position. The neutral position is the operating condition when the
Buchholz relay is filled with insulating liquid up the required level and the device to be protected operates
without any fault.
Tighten the cable gland
Fit the cap
Tighten 4 screws M5 (maximum torque 3 Nm)
8
5. Functional test
The test can be performed with the help of a test key (mechanically) or by a special test pump (pneumatically). Perform the test while
the eBR Electronic Buchholz Relay is filled with insulating liquid up to the required level.
5.1 Mechanical testing by test keys
5.1.1 Volume alarm verification
Proceed following the actions
Remove the higher cap nut (1/F)
1
Press the test key (2/F) (check of level alarm)
Verification of correct function from the control room
Release the test key
Fit and tighten the higher cap nut
2
Fig. F
5.1.2 Trip verification
Proceed following the actions
Remove the smaller cap nut (1/G)
Pull toward the higher position the test key (2/G) (check of
trip)
1
Verification of correct function from the control room
Push the test key (2/G) to re-arm the trip
Fit and tighten the higher cap nut
Damper functioning
2
eBR Electronic Buchholz Relay with the feature „damper held in
response position“ are designed such that the damper after it was
operated due to an unacceptable high flow rate of the insulating liquid
is locked in its position and, hence is kept in this position even after the
flow rate has been reduced. This means that the signal generated is
Fig. G
CAUTION
For electronic Buchholz relays the damper und hence the lower switching system has to be unlocked after
the test by pushing the test key.
9
5.2 Pneumatic testing by pneumatic valve
This is performed by injecting air using a pump (furnished by COMEM on request as an accessory kit, causing the oil level inside the
eBR to drop down and actuate the alarm float.
Proceed as follows when using the kit:
Remove plug (2/H), screw valve (3/H) and relative nipple on relay valve (1/H)
Remove cap (4/H), insert pump (5/H) using the threaded connection and turn the lever to OFF, inject air as necessary to
activate internal mechanisms.
To restore the oil level and simultaneously bleed out internal air remove plug (7/H) and open ball cock (6/H).
After these procedures close cock (6/H) and plug (7/H), remove pump (5/H) and relative accessories (3/H) and (4/H) and
close valve (1/H) using plug (2/H).
Fig. H
6. What to do in the case of gas accumulation
In case of alarm, the gas should be checked immediately to determine the cause of the fault and avoid additional damages. To this end,
withdraw the gas from the eBR and analyze it. For gas sampling and transport it is recommended to use the “Gas Sampling device”
supplied by COMEM (see Annex C).
10
7. Operation and maintenance
The eBR Electronic Buchholz Relay is ready for immediate operation after installation, electrical connection and power supply.
7.1 Operation
It is possible to detect the gas accumulation in different way:
Checking the graduated windows
Checking the gas accumulation alarm signal
Continuously via analog output 4-20 mA
Continuously via digital output RS 485 (MODBUS RTU protocol)
It is possible to verify the dampers status:
Checking the alarm/trip signal
Via digital output RS 485 (MODBUS RTU protocol)
It is possible to activate a relay (optional, see annex B) to switch an external electrical petcock
7.2 Maintenance
The eBR Electronic Buchholz Relay is insensitive to ambient conditions, provided these conditions were considered when selecting the
particular design of the Buchholz relay. Therefore, no special maintenance is required during operation.
eBR should be inspected and tested at specified intervals as described in the maintenance instructions of the plant operator. COMEM
recommends performing the following checks:
Check the exterior condition of the device
To verify the contacts function following the chapter 5
Check the gaskets condition and if any leakage exists
7.3 Movement, transport and storage
The eBR storage must remain in the original packaging and in a dry place with temperature range between -10°C to 40°C.
Upon receiving the eBR, please check:
The outer surface of the packaging to check that it is intact
That there are no breakages to the packaging
If damages are found, please contact COMEM, providing the data given on the shipping list and the serial number of the eBR.
CAUTION
Not to paint the device. In this case any guarantees concerning the corrosion resistance decline.
Only mild soap and water should be used to clean the electrical box cover. Solvents must not be used for
any reason as they will degrade the performance of the paint. Use of solvents on the unit will immediately
void the warranty.
When you install the device please follow section 3, 4 and 5.
11
Appendix A – Modbus (RTU) Registers
A.1 Addressing
This electronic Buchholz relay has a default address equal to 32 and its address can be changed from 32 to 47.
It is not possible to give an address outside of range from 32 to 47.
The address can be modified from default value by dipswitches on electronic board.
The dipswitches involved are ones from 1 to 4 and they can be modified according to table 1.
Fig. I
DIPSWITCHES
ADDRESS
1
2
3
4
32
OFF
OFF
OFF
OFF
33
ON
OFF
OFF
OFF
34
OFF
ON
OFF
OFF
35
ON
ON
OFF
OFF
36
OFF
OFF
ON
OFF
37
ON
OFF
ON
OFF
38
OFF
ON
ON
OFF
39
ON
ON
ON
OFF
40
OFF
OFF
OFF
ON
41
ON
OFF
OFF
ON
42
OFF
ON
OFF
ON
43
ON
ON
OFF
ON
44
OFF
OFF
ON
ON
45
ON
OFF
ON
ON
46
OFF
ON
ON
ON
47
ON
ON
ON
ON
Table 5
12
A.2 Registers Tables
In the tables 6 are showed the visible via Modbus (RTU) registers.
A.2.1 Main register Table
REGISTER
TYPE
R/W
FUNCTION
0x2000
W
R
Electronic board input
0x2001
W
R/W
Electronic board output
0x2002
W
R
Level probe value (mml)mml
0x2003
W
R
Operation number IN1
0x2004
W
R
Operation number IN2
0x2005
W
R
Relay operation number
0x2006
W
R
Time (minutes) electronic board switched on
0x2007
W
R
Time (days) electronic board switched on
0x2008
W
R
Max level current day
0x2009
W
R
Min level current day
0x200A
W
R
Software version
A.2.2 Memory registers
Table 6
Maximum and Minimum values are stored and saved from register 0x2100 to register 0x215F.
th
The last four weeks data (from current day) are stored and saved daily, at the beginning of the 5 week the maximum and minimum
values of the entire older week are stored and saved in 0x2138 and 0x2139 registers and so on.
Summarizing, in this table (7) the data are collected as follows:
1)
2)
In the first 28 rows are saved max and min of the latest 28 days;
In the remaining rows are saved max and min of the oldest 19 weeks.
REGISTER
TYPE
R/W
FUNCTION
0x2100
W
R
Level Sensor Maximum Value Day 1
0x2101
W
R
Level Sensor Minimum Value Day 1
0x2102
W
R
Level Sensor Maximum Value Day 2
0x2103
W
R
Level Sensor Minimum Value Day 2
0x2104
W
R
Level Sensor Maximum Value Day 3
0x2105
W
R
Level Sensor Minimum Value Day 3
………
…..
…..
…………………………………………..
0x2134
W
R
Level Sensor Maximum Value Day 27
0x2135
W
R
Level Sensor Minimum Value Day 27
0x2136
W
R
Level Sensor Maximum Value Day 28
0x2137
W
R
Level Sensor Minimum Value Day 28
0x2138
W
R
Level Sensor Maximum Value Week 5
0x2139
W
R
Level Sensor Minimum Value Week 5
………
…...
…..
……………………………………………
0x215C
W
R
Level Sensor Maximum Value Week 23
0x215D
W
R
Level Sensor Minimum Value Week 23
0x215E
W
R
Level Sensor Maximum Value Week 24
0x215F
W
R
Level Sensor Minimum Value Week 24
Table 7
13
A.3 Register Description
A.3.1 Main Register Description
0x2000 Electronic board input
This register shows the input status:
BIT 0: shows the status of the input IN1 or JP10 (0=voltage on, 1 = voltage off).
BIT 1: shows the status of the input IN2 or JP12 (0=voltage on, 1 = voltage off).
BIT between 2 and 15: always 0.
0x2001 Electronic board output
This register shows the output status:
BIT 0: shows the status of the output JP13 (0=output switched off, 1 = output switched on).
BIT between 1 and 15: always 0.
0x2002 Level probe value (mml)mml
This register shows the level probe value.
0x2003: Operation number IN1
This register shows the operations of the input IN1 or JP10 (operation means the passage from switched on to switched off status) input
status). This value can be from 0 to 65535 (from 0x0000 to 0xFFFF).
0x2004: Operation number IN2
This register shows the operations of the input IN2 or JP12 (operation means the passage from switched on to switched off status) input
status). This value can be from 0 to 65535 (from 0x0000 to 0xFFFF).
0x2005: Relay operation number
This register shows the operations of the relay (operation means the passage from switched on to switched off status) input status). This
value can be from 0 to 65535 (from 0x0000 to 0xFFFF).
0x2006: Time (minutes) electronic board switched on
This register shows the minutes passed from the last electronic board powering. This value can be from 0 to 1439 (from 0x0000 to
0x059F). After I it will reset.
0x2007: Time (days) electronic board switched on
This register shows the days passed from the last electronic board powering. This value can be from 0 to 65535 (from 0x0000 to
0xFFFF).
0x2008: Max level current day
This register shows the max level of the current day (this value will be saved in the EEprom when the day finishes). This value can be
from 0 to 1023 (from 0x0000 to 0x03FF).
0x2009: Min level current day
This register shows the min level of the current day (this value will be saved in the EEprom when the day finishes). This value can be
from 0 to 1023 (from 0x0000 to 0x03FF).
0x200A: Software version
This register shows the software version of the electronic board.
14
Appendix B – Petcock
On demand the electronic eBR Electronic Buchholz Relay can be supplied with the possibility to manage via MODBUS an output relay.
This output relay could be utilized for the gas discharge valve opening for example
B.1 Connection
The connection can be done directly on the electronic board following the picture below
C
NC
NO
Fig. L
NO: normal opent
NC: normal closed
C: common
B.2 Contact technical data
Contact Specification
Rated current/Maximum peak current (A)
10/15
Rated voltage/Maximum switching voltage
(V AC)
250/400
Rated load AC1 (VA)
2500
Rated load AC15 (230 V AC) (VA)
500
Breaking capacity DC1: 30/110/220 V (A)
10/0.3/0.12
Minimum switching load mW (V/mA)
300 (5/5)
Technical data
6
Mechanical life AC/DC (cycles)
-/10x10
Electrical life at rated load AC1 (cycles)
100000
Operate/release time (ms)
6/4
Insulation between coil and contacts
(1.2/50 s) kV
Dielectric strength between open contacts
(V AC)
Ambient temperature range °C
6(10 mm)
1000
-40 … +80°C
Table 8
15
Appendix C – Gas Sampling Device
C.1 DRAWING
Fig. M
C.2 CONSTRUCTION
The COMEM Gas Sampling device is manufactured from an aluminum alloy casting with the following fittings:
A tempered glass inspection window with graded markings for volume indication.
A gas sampling valve (2/M).
A bleed valve (3/M).
A gas inlet valve for pneumatic testing (5/M).
A valve for draining oil from the relay (this can be mounted on the right or left hand side of the body (6/M) or (7/M).
As a routine test all castings are tested by injecting ambient air at 2.5 bar for 2 minutes.
A certificate to this effect is supplied with the unit.
For the sake of standardization the device is fitted with the left and right hand valve supports but only one valve.
Customer can then choose which side he prefers.
With fittings for outside dia. 6 tubes, code 1RDPG00006 (on request);
with fittings for outside dia. 8 tubes, code 1RDPG00007 (on request);
with fittings for outside dia. 10 tubes, code 1RDPG00005 (standard).
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Appendix D – Order Sheet
Size and Model
Electrical scheme
(see chapter 4)
Seal
BR80
BS80
F
K
Q
R
S
W
U
Z
X
NBR -40°C
HNBR
VITON
Flow Speed
Alarm
1.0 / 1.5 / 2.0 / 2.5 m/s
Speed
1.0 / 1.5 / 2.0 / 2.5 / 3.0 m/s
Flow vane contacts
status verification
via Modbus
Contact supply
YES
NO
24/48V AC/DC
110/220V AC/DC
Table 9
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Appendix E – Figure and Reference number key
Picture
Description
A
B
eBR 80 – overall dimension
Internal frame (floats and flow vanes position)
C
Buchholz relay cover
D
Buchholz relay installation
eBR terminal board
E
F
Alarm volume mechanical test
G
Trip mechanical test
H
I
Pneumatic testing
Dip switches
L
M
Petcock connection on the electronic board
Gas sampling device
Table 10
Picture
A
B
C
D
E
F
G
H
M
Number
Description
1
2
9
Electronic Buchholz relay graduated windows
Drain plug
Electrical box cover
10
3
Cable gland M25x1.5
Floats
4
Flow vanes
5
6
Discharge valve
Pneumatic valve
7
Mechanical test key (alarm)
8
Mechanical test key (trip)
1
2
Buchholz relay
Pipe
3
Transformer tank
4
1
Transformer conservator
Un-losable screw
2
3
4
Electrical box cover
Cable gland M25x1.5
Terminal board
1
2
Mechanical test key cover (alarm)
Mechanical test key (alarm)
1
Mechanical test key cover (trip)
2
1
Mechanical test key (trip)
Pneumatic valve
2
Plug
3
Screw valve
4
5
Cup
Pump
6
Discharge valve
7
1
Plug
Upper GSD discharge valve
2
3
4
Gas sampling valve
Bleed valve
Lower GSD discharge valve
5
6
Valve for pneumatic testing
Valve for draining oil
7
Valve for draining oil
8
9
Upper Buchholz relay discharge valve
Lower Buchholz relay discharge valve
10
Pipe
11
Pipe
Table 11
18
19
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Strada Regionale 11, Signolo 22
36054 Montebello Vic.No (VI) - Italy
Tel. +39 0444 449311 - Fax -39 0444 449352 – 440359
http://www.comem.com
e-mail:comem@comem.com
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